H01J 1/34
Photo-emissive cathodes
Official title: Photo-emissive cathodes (H01J1/35 takes precedence)
H01J1/34 (Photo-emissive cathodes) appears on 269 US grants and 169 published applications in this corpus.
Search patents in H01J- Granted patents
- 269
- Published applications
- 169
- Assignees
- 127
- Inventors
- 528
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 6 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 6 | 0 |
| 1988 | 4 | 0 |
| 1989 | 4 | 0 |
| 1990 | 4 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 2 | 0 |
| 1994 | 7 | 0 |
| 1995 | 5 | 0 |
| 1996 | 4 | 0 |
| 1997 | 7 | 0 |
| 1998 | 10 | 0 |
| 1999 | 10 | 0 |
| 2000 | 8 | 0 |
| 2001 | 5 | 2 |
| 2002 | 4 | 3 |
| 2003 | 7 | 7 |
| 2004 | 5 | 7 |
| 2005 | 3 | 4 |
| 2006 | 6 | 5 |
| 2007 | 1 | 4 |
| 2008 | 3 | 2 |
| 2009 | 2 | 6 |
| 2010 | 7 | 5 |
| 2011 | 1 | 5 |
| 2012 | 5 | 2 |
| 2013 | 5 | 3 |
| 2014 | 5 | 4 |
| 2015 | 3 | 7 |
| 2016 | 7 | 11 |
| 2017 | 6 | 8 |
| 2018 | 11 | 4 |
| 2019 | 9 | 12 |
| 2020 | 19 | 11 |
| 2021 | 10 | 11 |
| 2022 | 3 | 10 |
| 2023 | 9 | 12 |
| 2024 | 8 | 15 |
| 2025 | 13 | 5 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Electron beam applicator and creation method of detection data in electron beam applicator15 Sep 2026US 12,738,441 B2Photo electron Soul Inc.
- Photocathode including nanostructures for extended wavelengths16 Jun 2026US 12,658,397 B2L3Harris Technologies, Inc.
- Electron beam devices with semiconductor ultraviolet light source21 Oct 2025US 12,451,314 B2Gaska Consulting, LLC
- Cathode member for electron beam generation, and method for manufacturing the same7 Oct 2025US 12,437,953 B2Kobelco Research Institute, Inc.
- Substrate stack epitaxies for photocathodes for extended wavelengths7 Oct 2025US 12,437,954 B2L3Harris Technologies, Inc.
- Electron Beam Application Device20 Aug 2026US 2026/0245828 A1Hitachi High-Tech Corporation
- Electron gun and electron microscope30 Apr 2026US 2026/0120990 A1Hitachi High-Tech Corporation
- Light source system and method of operation5 Mar 2026US 2026/0066607 A1xLight Inc.
- Electron beam devices with semiconductor ultraviolet light source19 Feb 2026US 2026/0051451 A1Gaska Consulting, LLC
- Substrate stack epitaxies for photocathodes for extended wavelengths18 Dec 2025US 2025/0385062 A1L3Harris Technologies, Inc.
Most cited
By later US patents
- Solid state electron amplifier71US 4,990,766 AMurasa International · 1991
- Generating electrons with an activated photocathode68US 7,015,467 B2APPLIED Materials.Inc. · 2006
- High data rate smart sensor technology62US 6,362,482 B1Advanced Scientific Concepts, Inc. · 2002
- Variable sensitivity transmission mode negative electron affinity photocathode50US 4,644,221 AThe United States of America as represented by the Secretary of the Army · 1987
- High data rate smart sensor46US 6,690,019 B2Advanced Scientific Concepts, Inc. · 2004